Alex the Allegator 2
The objective is to end the game with the highest score once either opponent has cleared all their tiles. Each turn a player may either place one of their colored tiles or slide any row/column by one unit. The row/column may not be moved again for one turn. When a group of four tiles forming a square is made, they are cleared from the board. If a player manages to remove 6 tiles in a rectangle they are awarded a special yellow tile which acts as a wild card allowing a square to be completed for any color. To make things even more interesting gray tiles will periodically appear on the board at random unfilled spots; a gray tile can only be removed with 3 yellow tiles although it's unlikely a player will use them in this way.
What makes this game interesting is that you can score points by completing squares of either color; for example, if your opponent slides a row and completes a square with your colored tiles he gets the points instead of you.
The game also has two levels of challenge for the human vs computer mode, a high score table, sounds, and music. Not bad for 72 hours!